I'm having the same exact problem. I've spent all day looking into it and haven't found anything to fix my problem yet.

Here's what's going on for me:
DVDs won't play in my PowerBook's superdrive or via my external DVD drive.
The DVDs don't mount either.
I have tried DVDs that have worked in the past and new ones.
I can see the file size of the DVD's via Disk Utility and Toast.
I have reset the PRAM.
I updated my computer with 10.4.8 thinking that it may have a patch or fix.
I also used Cocktail and permission repairs with no luck.

I don't know much about zones, but it's definitely not the dvds that are the problem. I've tried ones that have worked in the past as well as new ones. I'm wondering if my zone preferences got screwed up with an OS update or something. Anyone know how I can check which zone is my preference?

Well I looked into it some more and found an application called Region X, which allows you to change your dvd drive's region. When it started up it said that my region couldn't be found and an unknown error occurred. After that it let me assign region 1 (U.S.) but it was still a no go.

I threw in my OS X Tiger install dvd today and it worked fine, so it is definitely a dvd video problem.

Does anyone know who I can go to for help on this matter? I've been trying to figure this out for over a week and have posted on several forums but haven't had any luck fixing the problem. Is my next step to see an Apple certified technician or is there a way I can send my problem to Apple? I don't have any service plans and my warranty just expired.

Last weekend I tried (unsuccessfully) to upgrade the graphics card in the machine and one of the tests I did to try and get the card working was to backup the primary drive to a Firewire drive, clean install of Tiger and migrate from the hard drive when prompted by Tiger initial setup.

This did not fix the graphics card problem but it did fix the DVD player.

Ive had this problem for AGES. The dvds work fine on my iBook and MacBook but refuse to play on my G5. However I farted around with the drive firmware but I cant remember what i did as I just fumbled my way through it and it seemed to fix the problem. I used DVRflash or something.

I bought a new drive when my first drive started playing up and all was fine but then one day it started saying 'unsupported disc' for some discs. Wierd and VERY frustrating. Luckily it hasnt done it for a while now.

*goes to bookies to bet that drive no longer works when he gets home*

EDIT: Now my drive takes ages to read disks and needs to attempts at ejecting them. When i try to eject it the first time the disk unmounts then about 10 seconds later reappears on the desktop without physically ejecting. TBH it is fecking annoying.

Hopefully Nermal can figure something out for us because over Apple Discussions there are hundreds of people with the 'not supported' problem and I think my latest problem is related. However I dont even know what UDF is so i cant do diddly apart from buying a new drive again.

Well I haven't had time to work on this and it still isn't fixed. I was hoping it would happen to enough people and someone would have found a fix by now. I need to have it fixed within a month before I start traveling.

Huh, this happens to me also on my brand new 15" MBP (2.16 C2D).. I've tried 4 DVD movies & get the same "not supported" message in DVD player (when I tried VLC, when I click the play button, it just doesn't do anything). Heck, all of these DVDs play just fine in my Windows laptop!!

EDIT: After trying to view these movie DVDs, now when I insert a data DVD, it won't mount on my dekstop. I opened disk utilities, and it's listed there, but the option to mount it is greyed-out--I can only select unmount or eject... Maybe a faulty super drive? Music CDs work fine...

I am trying to solve this problem and one other. In addition to the unsupported error message sometimes the video goes black but the time code keeps running like the disc is playing normally. It crops up on me every so often. I thought it might be the type of disc I was using to record with on my DVR but I have changed several brands and the problem keeps coming back. I fixed this problem in the past by trashing my DVD prefs. I am trying to find where the DVD player keeps the previously played list so it can go back to that spot when you insert the disc again. I would like to trash those also.

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